Using Applet in JSP
Example program which illustrates use of <jsp:plugin> tag to
include Applet in JSP page
What is applet ?
Applet is java program that can be embedded into HTML
pages. Java applets runs on the java enables web browsers such as mozila and
internet explorer. Applet is designed to run remotely on the client browser, so
there are some restrictions on it. Applet can't access system resources on the
local computer. Applets are used to make the web site more dynamic and
entertaining. For reading more detail on apple visit: http://www.roseindia.net/java/example/java/applet/
JSP-Applet
To use applet in JSP page we can use <jsp:plugin>.
By the use of <jsp:plugin> you can include an applet and JavaBean
in your JSP page. Syntax of <jsp:plugin> is :
<jsp:plugin
type="bean|applet"
code="classFile"
codebase="classFileDirectory"
[ name="instancename"
]
[
align="bottom|top|middle|left|right"
]
[
height="displayPixels" ]
[
width="displayPixels" ]
[ jreversion="JREVersion"
]
.................
>
[<jsp:params>
<jsp:param name="parametername"
value="parametervalue" />
..........
</jsp:params>]
[<jsp:fallback>
text message
..........
</jsp:fallback>]
</jsp:plugin> |
Attributes:
- type: this is the type of object plugin will
execute. You have to specify it either bean or applet since it
has no default value.
- code: name of the java class file. You must
have to write ".class" with class file name.
- codebase: absolute or relative path of
directory where applet code file exists.
- name: name of bean or applet instance.
- align: position of applet or bean display on
the browser.
- height: as its name signifies, height of
applet or bean display
- width: as its name signifies, width of applet
or bean display
- jreversion: version of Java Runtime environment
- <jsp:params>: name and parameters value
passed to applet or bean.
- <jsp:fallback>: a text message to be
displayed if applet plugin cannot be started.
To plugin an applet in JSP page we require an applet.
So we have made an applet "ButtonMoveApplet.java". Code for this
applet file is given as below:
ButtonMoveApplet.java
import java.io.*;
import java.awt.*;
import java.util.*;
import java.applet.*;
import java.awt.event.*;
public class ButtonMoveApplet extends Applet {
Button move;
Random r;
public void init() {
setLayout(null);
move = new Button("Click me");
add(move);
move.reshape(10,10,70,30);
r = new Random();
setBackground(Color.red);
setForeground(Color.yellow);
}
public void paint(Graphics g){
g.drawString("Welcome JSP-Applet",100,100);
}
public boolean action(Event evt, Object whatAction) {
if (!(evt.target instanceof Button))
return false;
String buttonLabel = (String)whatAction;
if (buttonLabel == "Click me") {
move.reshape(Math.abs(r.nextInt())%(size().width-70),
Math.abs(r.nextInt())%(size().height-30),70,30);
repaint();
}
return true;
}
}
|
To use this applet we have used <jsp:plugin> in AppletJsp.jsp.
This applet is being used in JSP file by the use of following code.
....................
....................
<jsp:plugin type="applet" code="ButtonMoveApplet.class"
width="400" height="400">
<jsp:fallback>
<p>Unable to load applet</p>
</jsp:fallback>
</jsp:plugin>
..................
.................. |
Full code for AppletJsp.jsp is gievn as below:
AppletJsp.jsp
<%@ page language="java" %>
<html>
<head>
<title>Welcome JSP-Applet Page</title>
</head>
<body>
<jsp:plugin type="applet" code="ButtonMoveApplet.class"
width="400" height="400">
<jsp:fallback>
<p>Unable to load applet</p>
</jsp:fallback>
</jsp:plugin>
</body>
</html> |
Steps for running this example:
- Create and save ButtonMoveApplet.java
- Compile and put its class file in your web
folder(e.g Example in our case)
- Create and save AppletJsp.jsp
- Start tomcat server and type following URL in web
browser:
http://localhost:8080/Example/AppletJsp.jsp
You will get following output.
Output:
Download Source Code
|
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